Specifications

Configuration Tasks

Cisco IOS Release 12.0(3)T

Routing

In this application, the cable modem acts as a router to connect to existing networks. A typical use

would be if you are connecting the cable modem to an internal Ethernet hub that is connected to an

existing PC network. You can also connect the cable modem directly to as many as four PCs via the

Ethernet ports on the rear panel.

The cable modem is automatically conﬁgured to use the IP address of the Cisco uBR7246 headend

cable router as the cable modem’s default IP gateway.

Figure 5 Cisco uBR904 in a Routing Conﬁguration with a Hub

You can conﬁgure the Cisco uBR904 cable modem to function like a router using one of the

following methods:

• Manual conﬁguration using the CLI. See the sections “Conﬁguring a Host Name and Password”

on page 9 and “Customizing the Cable Modem Interface” on page 16 for details.

• Advanced conﬁguration using the System Conﬁguration dialog box in the setup facility. See the

chapter “Conﬁguring Advanced Routing or Bridging Using Setup” in the Cisco uBR904 Cable

Modem Installation and Conﬁguration Guide for details.

Conﬁguration Tasks

The Cisco uBR904 cable modem typically is conﬁgured automatically on power-up using a

conﬁguration ﬁle generated by the cable service provider and delivered via the Cisco uBR7246

universal broadband router installed at the cable headend. All of the conﬁguration tasks listed below

are optional.

• Conﬁguring a Host Name and Password, page 9

• Conﬁguring Ethernet and Cable Modem Interfaces, page 10

• Conﬁguring Routing, page 11

• Conﬁguring Bridging, page 13

• Reestablishing Plug-and-Play Bridging, page 15

• Customizing the Cable Modem Interface, page 16

Note Console sessions and TTY sessions are supported by the cable modem.

CATV

coaxial cable

Cable

Modem

Ethernet Ethernet

HUB

LAN

13306

Cisco uBR7246

CMTS

HFC network